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Variation in Dorsal Pattern in Fan-Throated Lizard - Sitana Ponticeriana Cuvier, 1829

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Variation in Dorsal Pattern in Fan-Throated Lizard - Sitana Ponticeriana Cuvier, 1829 CIBTech Journal of Zoology ISSN: 2319–3883 (Online) An Online International Journal Available at http://www.cibtech.org/cjz.htm 2012 Vol. 1 (1) May-Aug 12, pp.55-60/Pratyush et al., Research Article VARIATION IN DORSAL PATTERN IN FAN-THROATED LIZARD - SITANA PONTICERIANA CUVIER, 1829 P. Pratyush1, I. Desai2, R. Soni1 and B. Suresh1* 1Division of Biodiversity and Wildlife Biology, Department of Zoology, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara – 390 002 2N. V. Patel College of Pure and Applied Sciences, Vallabh Vidhyanagar, Anand - 388120 *Author for Correspondence ABSTRACT Fan-Throated Lizard Sitana ponticeriana is a medium sized ground dwelling agamid lizard widely distributed throughout the country except for the dense forests of Western Ghats, north eastern hills and interiors of deserts. S. ponticeriana can easily be distinguished from rest of the Agamids by the presence of only four toes in the hind limb. A characteristic diamond shaped pattern onto its dorsum is the prominent morphological features for the identification of the species. However, when the individuals of the species were keenly observed it was found that the diamond shaped pattern tend to vary between the individuals. Analysis of the results of the present study revealed the presence of eight defined patterns within the individuals of the population sampled. The pattern analysis on a broader geographical scale could be of great significance in developing an important morphological character for establishing sub- species or geographical races or ecotypes within the species S. ponticeriana. Key Words: Sitana Ponticeriana, Agamidae, Diamond Shaped Patch, Pattern Variation, Ecotypes INTRODUCTION The Fan-Throated Lizard Sitana ponticeriana Cuvier, 1829 (Figure 1) is a unique medium sized ground dwelling agamid lizard and is widely distributed throughout India ranging from the foot hills of Himalayas to the plains of Kanyakumari, except for the dense forests of Western Ghats, North-eastern hills and interiors of deserts (Tikader and Sharma, 1992 and Daniel, 2002). Habitat of S. ponticeriana consists of all the biotypes, chief amongst them are the dry deciduous forests and scrublands. The species is very agile and moves on hot surfaces with astonishing speed and ease. This species attains a maximum length of 44 mm (snout to vent length). The colouration is olive-brown above, with a series of rhomboidal patches along the middle of the back. A more or less distinct light band is seen along each side of the back. The males especially the large territorial ones extend a throat fan as courtship behaviour. The fan is the dermal appendage or gular flap found only in the males of this species and thus the name ‘Fan- Throated Lizard’, females shows a complete absence of this gular flap. They prefer short bushy scrubs for cover as well as use the shrub canopy for its peculiar courtship display (Shanbaug et al., 2003). During a preliminary study on the habitat utilization of S. ponticeriana in a scrubland in the out skirts of Vadodara city in Gujarat, one noticed remarkable variation in the dorsal pattern amongst the individuals of the population. This observation prompted one to extend an in depth study to other parts of the state of Gujarat and collect sufficient data pertaining to dorsal pattern variation in S. ponticeriana. Therefore, the present study was conducted with an objective to analyze and categorize these variations in dorsal pattern in S. ponticeriana and use the data in future for identifying various geographical races and also to understand whether the pattern play any role in mate selection. MATERIALS AND METHODS Study Area The present study was initiated in a scrubland located to the west of Vadodara city that spreads over an area of 7 sq km. The area is actually a part of ravines of two perennial rivers of central Gujarat. The terrain is highly undulating with steep slopes at many locations and the scrubland supports a high density 55 CIBTech Journal of Zoology ISSN: 2319–3883 (Online) An Online International Journal Available at http://www.cibtech.org/cjz.htm 2012 Vol. 1 (1) May-Aug 12, pp.55-60/Pratyush et al., Research Article of S. ponticeriana. Study was further extended to other parts of the state of Gujarat covering all the major terrestrial biomes and the specimens recorded were critically examined for their pattern variation. A list of the surveyed regions of the state and the localities therein is presented in Table 1; also these localities are depicted on the map of Gujarat state (Figure 2). Table 1: List of the Regions and the Sampling Localities therein Sr. No. Name of the Region Localities Selected for Sampling Scrubland of villages Bara and Tera; Grasslands of Kunothiya Dawn 1. Kutch and Naliya; Grassland and Scrublands of Narayan Sarovar and Lakhpat 2. North Gujarat Jessore Sloth Bear Sanctuary; Balaram-Ambaji Wildlife Sanctuary Jambughoda Wildlife Sanctuary; Kevdi Reserved Forest in Chhota Udepur; Pavagadh Hill Reserved Forest in Halol; Ratanmahal 3. Central Gujarat Wildlife Sanctuary in Panchmahal; Shoolpaneshwar Wildlife Sanctuary in Rajpipla; Vadodara Rural and Vadodara Urban Dhrangadhra Wild Ass Sanctuary in Dhrangadhra, Surendranagar; Scrub patches around Dwarka in Jamnagar; Girnar Hill Forest in 4. Saurashtra Junagadh; Gir PA (only periphery) in Junagadh as well as Amreli; Velavadar National Park and Victoria Park in Bhavnagar. Methodology The method adopted in the present study was Direct Sighting or Visual Encounter method. The areas were thoroughly searched for the presence of the species, as species being much cryptic and tries to conceal itself with the environment, combing operations were carried out by disturbing the scrubs and bushes so that the movement of the individuals could enable in sighting them and could record further details on its morphology. The study was initiated during April 2008 and was carried out till December 2008 for a period of 9 months. Surveys were done on regular basis (once in a week) during both morning and evening hours. The morning surveys were conducted from 0700 hrs to 1100 hrs and the evening surveys were done from 1600 hrs to 1830 hrs. When any individual was sighted a close up photograph of its dorsal pattern was taken using a digital camera (Olympus C770). The variations seen in the pattern was also sketched in field notebook and later was drawn precisely by comparing with the corresponding digital image. RESULTS AND DISCUSSIONS Sitana ponticeriana can easily be distinguished from rest of the Agamids by the presence of only four toes in the hind limb. The rest body plan is similar to other agamids except for the character of four toes in the hind limb, a character unique to genus Sitana (Gunther, 1861). The name Fan-Throated Lizard is so given because the males of this species bear a large gular appendage which is a lose skin flap of the throat, that can be erected up in the form of a fan. This fan like gular appendage is roughly triangular in shape and extends from the tip of the lower jaw to a considerable length along the belly (Gunther, 1861 and Smith 1935). Females of this species do not possess any such gular appendage. The species can also be identified by the characteristic diamond shape pattern along the mid dorsal line of the body starting from the lower nuchal portion till the base of the tail (Gunther, 1861, Smith, 1935). Even though S. ponticeriana is widely distributed through the country (Tikedar and Sharma, 1992), literature mentioning any pattern variation within this species is inadequate. Sufficient literature was found to be available on the demography, interrelations and reproductive traits, seasonal variation in dietary pattern and also techniques of age determination in Fan-Throated Lizard (Shanbag et al., 2003; Radder and Shanbaug, 2003; Subarao and Rajabai, 1972; Pal et al., 2007 and Rath, 2007) but lead to a 56 CIBTech Journal of Zoology ISSN: 2319–3883 (Online) An Online International Journal Available at http://www.cibtech.org/cjz.htm 2012 Vol. 1 (1) May-Aug 12, pp.55-60/Pratyush et al., Research Article lacuna when literature was searched regarding variations in the dorsal pattern in S. ponticeriana. 57 CIBTech Journal of Zoology ISSN: 2319–3883 (Online) An Online International Journal Available at http://www.cibtech.org/cjz.htm 2012 Vol. 1 (1) May-Aug 12, pp.55-60/Pratyush et al., Research Article It was indeed surprising that though being a common agamid lizard and a dominant species in the scrublands, S. ponticeriana escaped the attention of researchers as well as naturalists in this particular aspect of pattern variation. Pattern Variation While critically examining the individuals of S. ponticeriana we observed that the diamond pattern on the dorsum of the animal is not uniform amongst all the members. A close examination of the pattern revealed that the pattern on the dorsum is not individualistic, yet a marked difference in the pattern was evident in the population. Based upon the observations, at least eight prominent distinguishable patterns have been described within the studied population of S. ponticeriana. Males of this species were found to possess at least three distinct patterns whereas females showed five distinct patterns. Altogether eight distinct patterns were identified from the species occurring in the western part of the country. However, no sex specific variation was observed, and therefore pattern variation as a function for sexual dimorphism could not be ascertained. Though males by and large showed uniformity in their patterns, the females showed variation to a greater extent. As per the description given by Smith (1935), there are dark brown, black edged six diamond shape patches along the mid dorsal line of the body from the lower nuchal portion till the base of the tail and sometimes a light vertebral line dividing them.
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